Signors



July 1930- F. ABURNINGHAM ETAL Re. 17,728

July 15, 1930. F. A. BURNINGHAM ETAL 17,728

SPECIFIC GRAVITY INDICATOR Original Filed June 13, 1925 3 Sheets- Sheet2 July 15, 1930. F. A. BURNINGHAM ETAL 17,723

SPECIFIC GRAVITY mmcmon Original Filed June 13, 1925 3 Sheets-Sheet, 3

mare 104%? 2 Ji /M47720? of Figure 3.

Reiauecl July 15, 1930 UNITED 'STA res PATENT OFFICE I'OBTER A.BURNINGHAM AND HUGH K. MOORE, OF BERLIN, NEW .HAMPSHIRE, AS-

SIGNORS, BY MESNE ASSIGNMENTS, TO OLD BOSTON, MASSACHUSETTS, ACORPORATION COLONY TRUST COMPANY, TRUSTEE, OF OF MASSACHUSETTSSPECIFIC-GRAVITY IN DICATOB Original No. 1,887,455, dated January 1,1929, Serial No. 36,823, filed June 13, 1925. Application for reissuefiled February 11, 1929. Serial No. 339,253.

In many industries, such, for example, as the manufacture of paper,waste liquors should be as free as possible from valuable chemicalconstituents.

The present invention has for its object the indicating of certain datato indicate whether ornot such losses are being kept within reasonablelimits. Furthermore, the indication may be at a point distant from thewaste liquor outlet and preferably in the plant oflice where it sirablecheck on the work of those whose duties are to keep these losses down.

By indicating the specific gravity of the waste li uor the concentrationof the chemical constituents therein is continuously ascer tainable andif the rate of flow of waste is known the amount of the losses is easilycomputable. V

Primarily, therefore, this invention relates to a device forcontinuously indicating, preferably at a distance, the specific gravityof the waste liquor and associating with this device means by which thevolume of flow of this liquor to waste is ascertainable. Were it not forthe flow indication it might be possible for excessivelosses to beconcealed by the dilution of waste liquor of excessively that thespecific gravity indicator would fail to disclose the true amount oflosses.

For a more complete understanding of this invention, reference may behad to the accompanying drawings in which 35 Figure 1 is a somewhat diarammatic perspective showing an application of the subect matter of thisinvention. .Figure 2 is'a side elevation of the specific gravityindicator,

eing shown somewhat diagrammatically.

Figure 3 is an'enlarged detail in elevation. Figure 4 is a detailsectionton line 44 Figure 5 is a section on line 5.,5 of Fig ure 2.

Figure 6 isa vertical section modified construction of float.

Referring to Figure 1, 1 indicates a tank or reservoir having an inletpipe 2 for waste liquor and aweir 3. The level of the pool through awill serve as a de-' the electrical mechanism,

sure chamber 4 inserted somewhat belowthe] level of the liquor and atube 5 extending therefrom thr ugh which the pressure due to hydrostatichead of the liquor above the lower edge of the chamber 4. iscommunicated to a transmitting indicator 6 which may be of a type to bemore full described and from which through, wires 7 t e indication maybe transmitted to an indicator 8 which is pref erably positioned in theplant oflice where it is inaccessible to the workmen having conresents acone plant mana-' waste llquor.

trol of the rate of flow and tinuous visible indication to t ger of therate of flow of the prises a tanklO in communication near its lower 'endthrougha pipe 11 with the tank 1 and having'near its upper end anannuular overflow chamber 12 communicating with the interior of the tankthrou h a series of openings 13 and into which t e liquor from the tankoverflows when in operation. A pipe 14 leading from this annularoverflow chamber conducts the liquor passing through the tank either towaste or it is otherwise disposed of as may be found convenient. Thepipe 11 being open permits a steady flow of liquor from the tank 1through the tank 10 so that the liquor in the tanklO is at all timessubstantially in the same condition as to its proportion of chemicalcontent as the liquor being run over the weir 3. Within the tank 10 is ahydrometer fioat 15. As shown in Figures 2 and 5, this float comprises ashort cylindrical chamber having dome shaped upper and lower ends 16 and17. This 0 amber e specific gravity indicator to which this I -inventionis more particularly directed comis weighted to a suitable extent withshot or other similar material as at 18 and is then hermetically sealed.To its upper end 16 is fixed. a stem 20 which extends between a pair ofguide rollers 21 carried by the lower face of a frame piece 22 archingover the upper end of the tank 10. To the upper face 0 this piece 22 isa U shaped strap 23 having a perforation 24 at its'upper end in axialalinement with a similar perforation through the piece 22 and throughwhich the stem 20 projects. Between the side walls of the member 23 thestem 20 is surrounded by a tension coil spring 25 which is fixed at itsupper end to a collar 26 pinned or otherwise fastened to the stem 20.The lower end of this spring 25 is fixed to .the piece22.

This spring acts to hold the float 16 submerged beneath the level of theliquor in the tank 10. At the upper end of the member 23 is a laterallyextending frame piece 30, the outer end of which may be braced as bymeans of a bracket piece 31 fixed at its lower end to the outer wall ofthe overfiow chamber 12. Upstanding from the piece 30 are supportingbars 82 to which may be fixed an electrical transmitting member 35. Alsoextending from the frame piece 30 and a short piece 36 paralleltherewith are upstanding supports 37 between which is pivoted a sector40 so positioned that the longitudinal axis of the stem 20 passessubstantially tangent to its periphery. Above a pair of guide rollers 42betwee'nwhich the upper end of the stem 20 passes, a flexible metallicribbon or strap 45 is fixed at its lower end to the upper end of thestem 20 and at its other end to a suitable point on the periphery of thesector 40. This ribbon or strap 4L5 is held under tension by anysuitable means such as a counterwei ht 48 connected to the sector 40.With this construction it will be seen that as the float 15 rises andfalls, due to changes in the specific gravity of the liquor within whichit is immersed, a vertical motion is imparted to the stem 20 and throughthe strap 45 an oscillatory mo-.

tion is imparted to the sector 40. i

The electrical transmitting device 45 may be of any suitable type, butas herein shown comprises a pair of coils 50 mounted at opposite ends ofa rock lever 51 and arranged to move on.or oil of a pair of soft ironcores 52. This rock lever 51 has pivoted thereto a link 54 also pivotedto the sector 40. In order that the extent of rocking motion of the rocklever 51 relative to the rockingof the sector 40 may be adjusted;provision is made for adjusting the distance-from the center ofoscillation 56 of the sector-of the attachment to the sector of the link54. One means for eifecting such an adjustment is shown best in Figures3 and 4.

Referring to these figures it will be seen that the sector 40 has areadilly arranged slot the face of the sector 40 and clamp the sec- .61having a head 62 overlapping the face of the sector 40 on one side. Thisblock 61 has a threaded shank portion 63 which extends through and isthreadedinto a nut 6 This nut 64; has integral therewith a sleeve 65which surroundsthe threaded shank 63 and bears at its inner end againsta washer 66 engaging the outer end 67 of a cap member which surroundsthe smaller end of the block 61 and bears against the opposite face ofthe sector 40 from the portion 62. By screwing the nut 64 in the properdirection the cap 67 may be pressed firmly against tor between it andthe portion 62 in order to hold the block 61 in any position ofadjustment lengthwise of the slot 60. The sleeve portion 65 issufiiciently long to pass through a carrier block 7 O which is permittedto rock 35 which may be fixed in any lengthwise adjusted position withinthis carrier block by means such as a set screw 72 to adjust theeffective length of the link.

The coils 50 are connected as illustrated to the terminals of thesecondary 80 of a transformer, the primary 81 of which is connected tothe two sides of a suitable alternating current supply service line 82.vAlso in series with these coils 50 are coils 85 of a receivingindicator, these coils also being carried by a rock lever 86 andarranged to pass over to a more or less complete extent I the soft ir'oncores 87 It will be noted that'one of the coils 50 which is shownfurther removed from its core 52 is connected in series with that coil85 which is further on its core and like wise that the coil 50 which isfurther on its the coils 50, varying with changes in level of the float15 due to changes in specific gravity of the liquor to be measured, iscaused to efi'ect an indication at a distance on the indicator 90. Theindicator 8 may be of the same type as the indicator 90 and receive itscontrol from the sending indicator 6 in "a similar manner. The indicator6 may be of any type such as is well known in the art and no detaildescription of any particular mechanism is therefore believed tobe'neoessary.

In some cases it may be desirable to compensate for changes intemperature of the'liqnor in obtaining the measurements of the specificravity. This may be done by using a float %or the. specific gravitymechanism, such as is illustrated in Figure 6. In this figure thesubstantially cylindrical float 100 is provided with flexible expansibleends 101 which may be formed of plates having annular corrugationstherein. This float is weighted as by means of shot 102 and above theshot a volatile liquid such as 103 may be placed therein, this liquidvolatilizating more or less according to the temperature to which thefloat is subjected and acting in response to such volatilization toexpand the float more or less, the upper and lower walls 101 yielding inresponse thereto. Thus the displace ment of the float is increased'onincrease of temperature so that the actual weight of liquid displaced byit in the float tank is substantially the same throughout thetemperature range for which the mechanism is de- Such a temperature re--signed to operate. sponsive float may be used ordinarily through acomparatively limited range of temperature changes with a sufiicientdegree of accuracy.

Having thus described certain embodiments of this invention, it shouldbe evident to those skilled in the art that various chan es andmodifications might be made therein without departing from its spiritor' scope as defined by the appended claims.

We claim:

1. A device of the class described comprising a rockable sector, ahydrometer float, a

flexible member enga cable with the periphery of said sector anoperatively connected to said float, an indicating device, and operativeconnections from said sector to said device including an elementadjustable toward and from the center of rocking of said sector.

2. A device of the class described comprising a rockable sector, ahydrometer float, a flexible member enga cable with the periphery ofsaid sector an operatively connected to said float, an indicatingdevice, and operative connections from said sector to said deviceincluding an element adjustable in its efiective length and having itsattachment to said sector adjustable toward and from the center ofrocking thereof.

3. A device of the class described comprising a tank having connectionsto a supply of liquid, the'specific gravity of which it is desired tomeasure to establish a level of such liquid therein, a float insaid-tank beneath said liquid level, a stem extending upwardly from saidfloat, a guide member above said tank in guiding engagement with saidstem. at two spaced points, a spring carried by said guide member andarranged to press said stem and float downwardly, a sector pivoted abovesaid tank with the axis of said stem'substantially tangent to itsperiphery, a flexible member connecting said stem "to said periphery tobe wrapped thereon or unwrapped therefrom as said float rises or lowers,an indicating device, and operative connections from said sector to saiddevice.

liquid therein, a float in said tank beneathsaid liquid level, a stemextending upwardly from said float, a sector pivoted above said tankwith the axis of said stem substantially tangent to its periphery, aflexible member connectm said stem to said periphery to be wrap ed tereon or unwrapped therefrom as sald oat rises or lowers, means formaintaining said flexible member taut, a guide member above said tank inguiding engagement with said stem at two spaced points, a spring carriedby said guide member'and arranged to-dpress said stem and floatdownwardly, an in lcatin device, and operative connections from. saisector to said device.

In testimony whereof we have aflixed our signatures.

FOSTER A. BURNINGHAM.

HUGH K. MOORE.

